Abstract
Nanfen open-pit iron mine is the largest single open-pit mine in Asia. Because of the lag of the extension project, the section has slowly spread in the shape of “V,” and disasters such as landslides occur frequently. In this study, first, the NPR anchor cable monitoring, which shows supernormal mechanical characteristics and can realize the monitoring and early warning target for the whole landslide process and early warning curve of bedding rock “2016-1101 landslide” in the lower wall of Nanfen open-pit mine, was analyzed, revealing the failure process of the bedding rock landslide and the force evolution characteristics of the NPR anchor cable. Then, based on the Fish language in FLAC3D and 3DEC software, the mechanical model of the NPR anchor cable was constructed, and numerical simulation was performed on the whole process of “16-1101 landslide” induced by accumulation of old landslide body. The results of this study indicate that the stress monitoring curves and failure characteristics of the NPR anchor cables in the whole process of landslide by the two numerical simulation methods are basically consistent with the field measurement results, providing a theoretical and practical basis for the mechanistic analysis and numerical simulation of other similar slopes.
Highlights
Under the blasting, rainfall, and human activity, the rock mass of slope weakens, causing a large number of engineering disasters [1,2,3,4,5,6]. e disaster because of large deformation during a landslide in an open-pit mine causes huge economic losses and seriously threatens the safety of life and property of the staff in the mine
FLAC3D and 3DEC numerical simulation software to realize the recurrence of the landslide process. e numerical analysis model of the negative Poisson’s ratio (NPR) anchor cable was constructed by Fish language in numerical simulation software. e model was analyzed, and the calculation was performed for the 161101 landslide to investigate the similarities and differences between the simulation and the actual monitoring results
Numerical simulation was carried out on the whole process of large deformation and failure of 16-1101 landslide, and the following conclusions were obtained: (1) Based on the theory of Cataclysm mechanics, a large deformation numerical calculation model of the NPR anchor cable was constructed, and the simulated curve has a significant constant resistance effect, confirming that the large deformation can be achieved without damage
Summary
Rainfall, and human activity, the rock mass of slope weakens, causing a large number of engineering disasters [1,2,3,4,5,6]. e disaster because of large deformation during a landslide in an open-pit mine causes huge economic losses and seriously threatens the safety of life and property of the staff in the mine. They constructed the mechanical model of “sliding force monitoring” and developed an NPR anchor cable with constant resistance characteristics, which can adapt to landslide monitoring in deep deformation conditions [18,19,20,21] On this basis, a wireless sensor network was built based on the GPRS dual-channel platform using Zigbee technology, and a multisource system cloud service platform was established for landslide monitoring to adapt to the complex environment sloping disaster monitoring and early warning system [22,23,24,25,26]. E constant resistance value of the NPR anchor cable is related to the material size of the constant resistance body and the external load
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